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|
package bench
import (
"errors"
"fmt"
"sync"
"testing"
"github.com/boltdb/bolt"
)
const (
BenchReadMode = "read"
BenchWriteMode = "write"
BenchSequentialTraversal = "sequential"
BenchRandomTraversal = "random"
)
type Benchmark struct {
db *bolt.DB
config *Config
}
func New(db *bolt.DB, config *Config) *Benchmark {
b := new(Benchmark)
b.db = db
b.config = config
return b
}
func (bm *Benchmark) Run(b *testing.B) {
// Read buckets and keys before benchmark begins so we don't knew the
// results.
buckets, err := buckets(bm.db)
if err != nil {
b.Fatalf("error: %+v", err)
}
bucketsWithKeys := make(map[string][]string)
for _, bucket := range buckets {
keys, err := keys(bm.db, bucket)
if err != nil {
b.Fatalf("error: %+v", err)
}
bucketsWithKeys[bucket] = keys
}
b.ResetTimer()
// Keep running a fixed number of parallel reads until we run out of time.
for i := 0; i < b.N; i++ {
var wg sync.WaitGroup
for j := 0; j < bm.config.Parallelism; j++ {
wg.Add(1)
go func() {
defer wg.Done()
if err := bm.readBuckets(b, bm.db, bucketsWithKeys); err != nil {
b.Fatalf("error: %+v", err)
}
}()
}
wg.Wait()
}
}
// Run benchmark(s) for each of the given buckets.
func (bm *Benchmark) readBuckets(b *testing.B, db *bolt.DB, bucketsWithKeys map[string][]string) error {
return db.View(func(tx *bolt.Tx) error {
bucketsCount := len(bucketsWithKeys)
count := 0
for bucket, keys := range bucketsWithKeys {
bucket := tx.Bucket([]byte(bucket))
if err := bm.readKeys(b, bucket, keys); err != nil {
return err
}
count++
}
if count != bucketsCount {
return errors.New(fmt.Sprintf("wrong count: %d; expected: %d", count, bucketsCount))
}
return nil
})
}
func (bm *Benchmark) readKeys(b *testing.B, bucket *bolt.Bucket, keys []string) error {
c := bucket.Cursor()
keysCount := len(keys)
count := 0
for k, _ := c.First(); k != nil; k, _ = c.Next() {
count++
}
if count != keysCount {
return errors.New(fmt.Sprintf("wrong count: %d; expected: %d", count, keysCount))
}
return nil
}
func buckets(db *bolt.DB) ([]string, error) {
buckets := []string{}
err := db.View(func(tx *bolt.Tx) error {
// Iterate over each bucket.
return tx.ForEach(func(name []byte, _ *bolt.Bucket) error {
buckets = append(buckets, string(name))
return nil
})
})
return buckets, err
}
func keys(db *bolt.DB, bucket string) ([]string, error) {
keys := []string{}
err := db.View(func(tx *bolt.Tx) error {
// Find bucket.
b := tx.Bucket([]byte(bucket))
if b == nil {
return errors.New(fmt.Sprintf("bucket %+v not found", b))
}
// Iterate over each key.
return b.ForEach(func(key, _ []byte) error {
keys = append(keys, string(key))
return nil
})
})
return keys, err
}
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